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pj
37079a0d84
Pins the sum-based predicate: a single new row matching delta and two new rows summing to delta both hold; two-row over-sum (double-submit) and under-sum cases both violate.
43 lines
1.6 KiB
TypeScript
43 lines
1.6 KiB
TypeScript
import assert from "node:assert/strict";
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import { test } from "node:test";
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import {
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balanceMatchesAddedSum,
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type LedgerRow,
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} from "../../../examples/folio/sanderling/predicates.ts";
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function row(key: string, signed: number): LedgerRow {
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return { key, signed };
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}
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test("single new row whose signed amount matches the balance delta holds", () => {
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const previous: LedgerRow[] = [row("a", 100)];
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const current: LedgerRow[] = [row("a", 100), row("b", 500)];
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assert.equal(balanceMatchesAddedSum(previous, current, 100, 600), true);
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});
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test("two new rows whose sum matches the balance delta holds", () => {
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const previous: LedgerRow[] = [];
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const current: LedgerRow[] = [row("a", 500), row("b", 300)];
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assert.equal(balanceMatchesAddedSum(previous, current, 0, 800), true);
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});
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test("double-submit case: two identical rows with sum exceeding the delta violates", () => {
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const previous: LedgerRow[] = [];
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const current: LedgerRow[] = [row("a", 500), row("b", 500)];
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assert.equal(balanceMatchesAddedSum(previous, current, 0, 500), false);
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});
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test("partial-credit case: two new rows whose sum falls short of the delta violates", () => {
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const previous: LedgerRow[] = [];
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const current: LedgerRow[] = [row("a", 200), row("b", 100)];
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assert.equal(balanceMatchesAddedSum(previous, current, 0, 500), false);
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});
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test("no new rows holds vacuously regardless of balance delta", () => {
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const previous: LedgerRow[] = [row("a", 100)];
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const current: LedgerRow[] = [row("a", 100)];
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assert.equal(balanceMatchesAddedSum(previous, current, 100, 100), true);
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assert.equal(balanceMatchesAddedSum(previous, current, 100, 999), true);
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});
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